A method for correcting a moving heat source in analyses with coarse temporal discretization. (August 2018)

• Record Type: Journal Article
• Authors: Partzsch, Marian; Beitelschmidt, Michael; Khonsari, Michael M
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 232:Number 15(2018)
• Page Start: 2736
• Page End: 2750
• Publication Date: 2018-08
• Subjects: Thermal analysis -- nonconstant motion -- moving heat source -- discrete displacements -- coarse time-step size -- energy-based correction; Mechanical engineering -- Periodicals; 621.05
• DOI: 10.1177/0954406217722807
• Languages: English
• ISSNs: 0954-4062

Abstract

The numerical simulation of a moving heat source from a fixed point observer is often done by discretely adjusting its position over the steps of a thermal transient analysis. The efficiency of these simulations is increased when using a coarse temporal discretization whilst maintaining the quality of results. One systematic error source is the rare update of a nonconstant moving heat source with regard to its magnitude and location. In this work, we present an analysis of the error and propose a correction approach based on conserving the specified heat from a continuous motion in analyses with large time-step sizes. Deficiencies associated with the correction in special motion situations are identified by means of performance studies and the approach is extended accordingly. The advantages of applying the proposed correction are demonstrated through examples.